package com.system.interceptor;

import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;

import com.lg.base.LoadProperties;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;


/**
 * sql处理啊，字段自动填充
 * @Package: com.system.interceptor
 * @ClassName: MybatisInterceptor.java
 * @Description:sql处理啊，字段自动填充
 * 
 * @author kaifa008
 * @date 2020年12月23日 下午1:46:19
 * @Copyright: 2020 Copyright (c) 2018 LgSteel
 */
@Intercepts({ @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
		@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
				RowBounds.class, ResultHandler.class }) })
public class MybatisSqlInterceptor implements Interceptor {

	@Override
	public Object intercept(Invocation invocation) throws Throwable {
		// 正式Linux直接返回
		if (LoadProperties.isReal == 1 && LoadProperties.windowOrLinux.equals("1")) {
			return invocation.proceed();
		}
		try {
			// 获取xml中的一个select/update/insert/delete节点，主要描述的是一条SQL语句
			MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
			Object parameter = null;
			// 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
			if (invocation.getArgs().length > 1) {
				parameter = invocation.getArgs()[1];
 			}
			// 获取到节点的id,即sql语句的id
			String sqlId = mappedStatement.getId(); 
 			BoundSql boundSql = mappedStatement.getBoundSql(parameter); // BoundSql就是封装myBatis最终产生的sql类
 			Configuration configuration = mappedStatement.getConfiguration(); // 获取节点的配置
 			System.out.print("执行sql:"+sqlId);
 			String sql = getSql(configuration, boundSql, sqlId); // 获取到最终的sql语句
			System.out.println(sql+"\n");
 		} catch (Exception e) {
			// log.error(e.getMessage(), e);
		}
		return invocation.proceed(); // 执行完上面的任务后，不改变原有的sql执行过程
	}

	// 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
	public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId) {
		String sql = showSql(configuration, boundSql);
		StringBuilder str = new StringBuilder(100);
		//str.append(sqlId);
		//str.append(":");
		str.append(sql);
		return str.toString();
	}
 	/**
	 * 如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理<br>
	 */
	private static String getParameterValue(Object obj) {
		String value = null;
		if (obj instanceof String) {
			value = "'" + obj.toString() + "'";
		} else if (obj instanceof Date) {
			DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
			value = "'" + formatter.format(new Date()) + "'";
		} else {
			if (obj != null) {
				value = obj.toString();
			} else {
				value = "";
			}
		}
   		return value;
	}

	// 进行？的替换
	public static String showSql(Configuration configuration, BoundSql boundSql) {
		Object parameterObject = boundSql.getParameterObject(); // 获取参数
		List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
		String sql = boundSql.getSql().replaceAll("[\\s]+", " "); // sql语句中多个空格都用一个空格代替
		StringBuffer sb=new StringBuffer();
		sb.append(" [");
  		if (parameterMappings != null && parameterMappings.size() > 0 && parameterObject != null) {
			// 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换<br>
			TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
			// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
			if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
				String v = getParameterValue(parameterObject);
				sb.append(v + ",");
				sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(v));
			} else {
				MetaObject metaObject = configuration.newMetaObject(parameterObject);// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
				for (ParameterMapping parameterMapping : parameterMappings) {
					String propertyName = parameterMapping.getProperty();
					if (metaObject.hasGetter(propertyName)) {
						Object obj = metaObject.getValue(propertyName);
						String v = getParameterValue(obj);
						sb.append(v + ",");
						sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(v));
					} else if (boundSql.hasAdditionalParameter(propertyName)) {
						Object obj = boundSql.getAdditionalParameter(propertyName); // 该分支是动态sql
						String v = getParameterValue(obj);
						sb.append(v + ",");
						sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(v));
					} else {
						sb.append("缺失");
  						sql = sql.replaceFirst("\\?", "缺失");
					} // 打印出缺失，提醒该参数缺失并防止错位
				}
			}
			if(sb.toString().endsWith(",")){
				sb.replace(sb.length() - 1, sb.length(), "");
			}
		}
  		sb.append("] ===>");
  		System.out.println(sb.toString());
		return sql;
	}

	@Override
	public Object plugin(Object target) {
		return Plugin.wrap(target, this);
	}

	@Override
	public void setProperties(Properties properties) {

	}
}